Nipple-holding chuck



,A ril 28, 1931.

NIPPLE HOLDING CHUCK Original Filed Dec. 16, 1926 i /0 I/ g a I. Il fi E[51 .5

lNUENTOR.

ATTORNEI].

c. RASMUSSEN 1,802,574

Patented Apr. 28, 1931 mu -M aren't OFFICE CHARLES RASMUSSEN, OF BACINE,WISCONSIN, A SSTGNORVOF QNE-HALF v'lO RALPH INGALLS, F RACINE, WISCONSINv NIPPLE-HOLDING CHUCK Original application filed December 16, 1926,Serial No. 155,117. Divided and this application filed June 13,

1928. Serial This invention relates generally to pipe threading machinesand more particularly to a nippleholding chuck or attachment especiallydesigned and adapted for use with pipe threading machines. The presentapplication is a division of the application of Charles Rasmussen filedDecember 16, 1926, Serial No. 155,117 for pipe threading machines.

One object of the invention is to provide, in a machine of thischaracter, an improved chuck and attachment therefor for holding thethreaded end of a small pipe section, whereby the unthreaded end thereofmay be threaded to produce a nipple without damaging the previouslythreaded end of the section clamped in the chuck.

Other objects and advantages reside in certain novel features of theconstruction, arrangement and combination of parts which will behereinafter more fully described and particularly pointed out in theappended claims, reference being had to the accompanying drawingsforming a part of this specifia cation, and in which Figure 1 is afragmentary view in side elevation showing one type of a pipe threadingmachine with a chuck or attachment embodying the present invention inuse thereon;

Figure 2 is a detail view in front elevation of the chuck shown inFigure 1 one of the jaws of the nipple chuck and the machine parts beingomitted for the sake of clearness and simplicity in illustration;

Figure 3 is an enlarged sectional-view taken on line 33 of Figure 2; and

Figure 1 is a detail plan View of one of the parts of the nipple holdingattachment.

The pipe threading machine with which the nipple holding chuck embodyingthe present invention is utilized is shown generally in Figure 1, and asillustrated, has the usual base of which a portion is shown at 10. Onthe base 10, the gear casing 11 is supported and carries the spindle 12provided at its ends with chucks 18 and 20 of the well known three-jawuniversal lathe type. -The spindle 12 and the chucks 18 and 29 thereonare rotated from an electric motor 23 by means of a gearing 2526 and theusual transmission unit (not shown). A die head designated generally at28 is provided and carries the chasers or pipe threading means, the diehead being slidably mounted on the base and fed therealong under thecontrol of the hand wheel feed 66. The details of the mechanism thus fardescribed, of themselves, form no part of the present invention andhence they have not been described or shown with particularity in thisapplication, but reference is made toxthe pending application abovereferred to and of which this case is a division for a full disclosureof these parts.

It is to be understood, however, that as shown in Figure 1, the pipe 78to be threaded is passed through the chucks l8 and 20 and held therebyfor rotation therewith and the hand wheel 66 is thus turned tocarrythedie head forward to the left'until thedie'chasers' cut into the pipe tomake the threads, after which'the die head is carried'further for- Wardby'reason of thethreaded engagement of the die chasers with the pipe.This operationoccurs, of cours,e,,only when a pipe of considerablelength, is being threaded and at such'time the nipple holding chuck isdetached fromthe standard chuck 20.

When it is desired tomake a nipple, or a relatively short pipe sectionthreaded at each end,'the stock is threaded at one end and a shortsection 116 cut OK, as shown in Figure 3. Jaws 117 having their clampingfaces threaded to fit the threaded end of'the pipe section or nipple, asshown, are at? tached to .each of the jaws 21 of chuck 20 by bolts 118,jaws 117 being provided with the lugs 119 which fit into recesses120inthe chuck jaws 21 whereby the jaws '117 are properlycentered withrespect to the axis of min m f t c u k: The ja 7 y be provided withspaced lugs 121 and 122 which fit over the adjacent edges of the jaws 21and provide additional means for holding jaws 117 in fiXed relation withrespect tojaws 21. The threaded end of the pipe sec tion 116 and awedging element in the form of a disk-shaped slug 123 are placed betweenthe jaws 117 and the chuck operated to impart clamping movement to thelatter. As shown in Figure 3, the jaws 117 are provided in their faceswith recesses 124: which receive the tapered edge 125 of a slug 123 uponclamping movement of aws 117 whereby the slug co-acts with the latterand the adjacent threaded end of pipe section 116 with a wedghaving jawsadapted to hold the threaded 5 nature.

CHARLES RASMUSSEN.

ing action to urge the latter axially with respect to jaws 117. Byreason of this construction and manner of operation, the threaded end ofthe pipe section or nipple 116 is tightly clamped between jaws 117 andheld against any rotary movement, and the threads on the threaded end ofthe pipe section protected during the threading operation of the diechasers on the unthreaded end of the pipe section. From the foregoing itwill be seen that means in the form of an attachment has been providedwhereby the machine may be readily adapted to make nipples, and thatthis attachment may be quickly secured to one of the chucks 20 andclamps the threaded end of the nipple securely without damaging thethreads during the threading operation on the other end of the nipple.

Of course, when a nipple is being threaded, there is no pipe 78 in themachine and the die head must be advanced well up to the nipple holdingchuck to bring its chasers into engagement with theunthreaded section ofthe nipple stock; By virtue of the 00- action of the threaded jaws forthe nipple holding chuck and of the disk-like slug, the nipple isrigidly and securely gripped and is thus held against all movementexcept the rotary movement imparted thereto by the chuck and yet whenthe jaws are retracted, the nipple is readily released from its chuck.

I I claim:

1. In a pipe-threading machine, a chuck having pipe-holding jawsprovided with threads adapted to fit a threaded pipe end, and wedgingmeans engageable with said pipe end under the actuating influence ofsaid aws upon clamping engagement of the latter with said pipe end tourge the same axially with respect to said jaws.

2. In a pipe-threading machine, a chuck having pipe-holding jawsprovided with threads adapted to fit a threaded pipe end, a disk-shapedslug engageable at its edge with said pipe end and actuated by said jawsupon clamping engagement of the latter with said pipe end to urge thesame axially with respect to said jaws,

3. In a pipe threading machine, a'chuck

